摘要: We propose a gauged U(1)H horizontal symmetry around TeV scale that is a subgroup of a
SU(3)H horizontal gauge symmetry broken at O(1014) GeV. The breaking generates right-handed
Majorana neutrino masses through a SU(3)H sextet scalar. A particular Majorana right-handed
neutrino mass matrix explicitly determines the remnant U(1)H at low energy which only couples to
b−s and µ−τ in the gauge eigenstate. The dangerous K − K¯ , D − D¯ mixing and Bs → µ
+µ
− are
kept to be safe because the relevant couplings are suppressed through high powers of small mixing
angles in the fermion rotation matrix. Our analysis which applies to the general case shows that
the Tevatron di-muon anomaly can be explained through the Bs and Bd mixing while keeping all
the other experimental constraints within 90 % C. L. For the B meson decay, the Bs → µ
±τ
∓ is
the leading leptonic decay channel which is several orders of magnitude below current experimental
bound